In a statement released to ET by Park County coroner Richard Wood, it was announced that Kidder "died as a result of a self-inflicted drug and alcohol overdose".

According to TMZ, Margot Kidder, the Superman alum, died due to an intentional drug and alcohol overdose.

Margot Kidder's death has been ruled a suicide. She became paranoid and disappeared for four days until she was found in a stranger's backyard and taken to Olive View Medical Center by police.

Maggie McGuane told the Associate Press that she knew her mom died from suicide after she went to her mom's home on May 13, the day her mom died.

She had been diagnosed with bipolar disorder and, in 1996, she suffered a public manic episode and nervous breakdown.

Now, nearly three months after Kidder's body was found by a friend in her Livingston, Montana home, a coroner there has ruled her death a suicide. Her obituary at the time said simply that she passed away at her home, and does not mention her cause of death.

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